Clean up vestigial mypy/type-stub deps now covered by additional_dependencies

.pre-commit-config.yaml

@@ -33,10 +33,6 @@ repos:
         args: [--fix]
       - id: ruff-format
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.991    # Use the sha / tag you want to point at
+    rev: v1.19.1    # Use the sha / tag you want to point at
     hooks:
       - id: mypy
-        # Pinned so the hook's own venv can build typed-ast, which has no
-        # wheel for Python 3.12+; this only affects mypy's own interpreter,
-        # not the --python-version it type-checks against.
-        language_version: python3.11

test-requirements.txt

@@ -1,6 +1,4 @@
 -r requirements.txt
-# Linting tools
-mypy
 # Testing tools
 nose2[coverage_plugin]>=0.12,<1
 mock>=1.0.1,<2